GPS-Equipped Pigeons Enlisted as Pollution Bloggers - A project known as PigeonBlog is using birds carrying high-tech backpacks to create accurate, detailed urban pollution maps. Related projects are also taking flight. [National Geographic]

Now let me get this straight... National Geographic don't have a reputation for doing April Fools Day jokes in November, do they?

Which means that Pigeonblog is for real, too.